BioRT-Flux-PIHM v1.0: a biogeochemical reactive transport model at the watershed scale
BioRT-Flux-PIHM v1.0: a biogeochemical reactive transport model at the watershed scale
复制标题
DOI：
10.5194/gmd-15-315-2022
复制
发表时间：
2022-01
影响因子：
5.1
通讯作者：
W. Zhi;Yuning Shi;H. Wen;L. Saberi;G. Ng;K. Sadayappan;Devon Kerins;Bryn Stewart;Li Li-Li
中科院分区：
文献类型：
--
作者：
W. Zhi;Yuning Shi;H. Wen;L. Saberi;G. Ng;K. Sadayappan;Devon Kerins;Bryn Stewart;Li Li-Li
抽象的。流域是连接陆地与水生系统的基本地球表面功能单位。许多流域尺度模型代表水文过程，但不代表生物地球化学反应传输过程。这限制了我们理解和预测溶质输出、水化学和质量以及地球系统对气候变化和人为条件的响应的能力。在这里，我们介绍了最近开发的 BioRT-Flux-PIHM（以下简称 BioRT）v1.0，这是一种流域规模的生物地球化学反应传输模型。该模型增强了之前开发的 RT-Flux-PIHM，集成了地表相互作用、表面水文和非生物地球化学反应。它能够模拟 (1) 浅水和深水分配，以代表地表径流、浅层土壤水和深层地下水，以及 (2) 生物过程，包括植物吸收、土壤呼吸和养分转化。代码的反应式传输部分已针对广泛使用的反应式传输代码 CrunchTope 进行了验证。 BioRT-Flux-PIHM v1.0 最近已在不同气候、植被和地质条件下的多个流域得到应用。本文简要介绍了控制方程和模型结构，重点介绍了模型的新方面。它还展示了一个模拟浅水和深水相互作用的水文学示例，以及两个与硝酸盐和溶解有机碳 (DOC) 相关的生物地球化学示例。这些示例以两种复杂的模拟模式进行说明。一种是空间集总模式（即由一条河流段连接的两个陆地单元），重点关注流域的过程和平均行为。另一种是空间分布模式（即数百个单元），包括地形、土地覆盖和土壤特性的详细信息。空间集总模式代表平均属性和过程以及时间变化，而空间分布模式可用于了解空间结构的影响并识别生物地球化学反应的热点。该模型可用于机械地理解气候、植被、地质和土地利用条件梯度下的耦合水文和生物地球化学过程。
Abstract. Watersheds are the fundamental Earth surface functioning units that connect the land to aquatic systems. Many watershed-scale models represent hydrological processes but not biogeochemical reactive transport processes. This has limited our capability to understand and predict solute export, water chemistry and quality, and Earth system response to changing climate and anthropogenic conditions. Here we present a recently developed BioRT-Flux-PIHM (BioRT hereafter) v1.0, a watershed-scale biogeochemical reactive transport model. The model augments the previously developed RT-Flux-PIHM that integrates land-surface interactions, surface hydrology, and abiotic geochemical reactions. It enables the simulation of (1) shallow and deep-water partitioning to represent surface runoff, shallow soil water, and deeper groundwater and of (2) biotic processes including plant uptake, soil respiration, and nutrient transformation. The reactive transport part of the code has been verified against the widely used reactive transport code CrunchTope. BioRT-Flux-PIHM v1.0 has recently been applied in multiple watersheds under diverse climate, vegetation, and geological conditions. This paper briefly introduces the governing equations and model structure with a focus on new aspects of the model. It also showcases one hydrology example that simulates shallow and deep-water interactions and two biogeochemical examples relevant to nitrate and dissolved organic carbon (DOC). These examples are illustrated in two simulation modes of complexity. One is the spatially lumped mode (i.e., two land cells connected by one river segment) that focuses on processes and average behavior of a watershed. Another is the spatially distributed mode (i.e., hundreds of cells) that includes details of topography, land cover, and soil properties. Whereas the spatially lumped mode represents averaged properties and processes and temporal variations, the spatially distributed mode can be used to understand the impacts of spatial structure and identify hot spots of biogeochemical reactions. The model can be used to mechanistically understand coupled hydrological and biogeochemical processes under gradients of climate, vegetation, geology, and land use conditions.